For all solar beginners: What is photovoltaic, will be simply explained on our article. When we talk about photovoltaics, we mean that we can collect solar energy, convert it into electrical energy and then use it as electricity (besides, solar energy can also be used to generate heat through solar collectors).
The surfaces on the roof (solar modules) consist of many solar cells. The solar cells in turn consist of many so-called semiconductors. And the semiconductors are pretty much silicon (or silicon).
The silicon in combination with other chemical elements is packed in layers in solar cells. If sunlight now strikes these layers, a voltage builds up between the layers like in a battery – electricity flows. More precisely: direct current. In order for us to be able to use this electricity, it still has to be converted into alternating current by the solar system (more precisely: the inverter of the system). Because it flows out of the socket with us.
Which different cell types are there for photovoltaic system?
There are a variety of materials and concepts for solar cells with different shapes, colors and performance data. Mostly a distinction is made between crystalline cells (monocrystalline, polycrystalline) and thin-film cells (including amorphous silicon, cadmium telluride, copper indium diselenide). Crystalline cells outnumber the market. Thin-film cells have the advantage of less material and energy input and can assume any module formats.
Why is solar power fed into the public grid? – Photovoltaic review
The network takes over in a self-consumption facilities with excess feed the function of the “electricity storage”. And the not self-consumed solar power is taken over immediately and distributed. Such systems are called networked. This concept is technically and economically an advantage for solar power. With a photovoltaic system you become a generator of electricity, but not self-sufficient. In Europe self-sufficient systems are rather rare. Here, photovoltaics – usually in conjunction with another power generation technology – supply a building with electricity (for example, huts in the Alps) that is far away from the electricity grid and therefore can not be economically connected to the grid.
What are the requirements of the systems for roof pitch and direction?
In general, photovoltaic systems can be mounted on pitched roofs and flat roofs, as part of the façade and on open spaces. The highest yields are achieved at about 35 degrees roof pitch and south roof. Even with a deviation from southeast to southwest and at the inclination of ± 20 degrees, the plants achieve more than 90 percent of their power. In inclined systems, the rain also cleans it of dust and dirt.
For more article about the photovoltaic systems, stay tuned us.